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In Reply to: RE: Papst motor rotation posted by twystd on September 22, 2015 at 22:29:03
Hi Twystd,
That Papst motor is a three phase delta wired motor. Connect one of the leads to one side of the AC line. Connect the second lead to the other side of the line to the second motor lead and to one terminal of the phase capacitor. Connect the third motor lead to the other side of the capacitor. If the rotation is what you want make a note of those connections and you are done. If the rotation is reverse of what you want, leave the connections from the motor to the cap as they are and move the second AC lead to the opposite side of the cap.
If you have not received to motor as yet you will find that the belt pulley is machined into the motor shaft and has a crown to keep the belt running true. Even if you are a skilled machinist or have a friend who is I'm guessing getting the platter on speed is going to be a challenge. You may save yourself a lot of aggravation by looking for a variable frequency drive to power the motor. I believe you will need 20 to 30 Watts.
Phil
Follow Ups:
I switched the wiring on the motor, and it is now running CCW. Thanks so much for the info.
I think Jim (tubesforever) at Applied Fidelity can help me out with the capstan modification. If not, I'm pretty sure I can find a machinist here in Austin that could do it. IIRC the induction motor on the original ROK TT also operates at the same RPM (1800) as the Papst, so should be just a matter of making an adapter for the Papst shaft to duplicate the capstan on the original ROK motor (which I have). At least I hope that is the way it will work out.
Thanks again for the wiring help.
twystd
Hi Twystd,
The Papst hysteresis synchronous motor and the induction motor both are four pole AC motors and therefore the rotating magnetic field rotates at 1800 RPM on 60 Hz in both motors. In a hysteresis motor the rotor becomes "permanently" (until the next start) magnetized and turns in synch with the field. In an induction motor the rotor is magnetized by current induced in the shorting bars. This requires a changing flux so the rotor must slip. The slip speed vs. torque load is dependent on the rotor design. 5% at rated load is typical. Note that the rated speed of a four pole washing machine motor is 1725 RPM.
This is going to be an iterative process. Have the machinist duplicate the pulley of the induction motor and check speed. Take slight cuts off the pulley until the platter speed is correct.
Phil
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